Method and apparatus for processing multiview video signal with part of non-reference view

ABSTRACT

The method for processing a multiview video signal according to the present invention acquires motion information generated by predictively coding a picture of a reference point, acquires motion information on a part of a block of the picture from among the motion information generated by predictively coding the picture of a non-reference point, and compresses the motion information acquired for every picture of the reference point and non-reference point and stores the compressed motion information.

This application is a National Stage Application of InternationalApplication No. PCT/KR2013/010065, filed Nov. 7, 2013, and claims thebenefit of U.S. Provisional Application No. 61/723,330, filed Nov. 7,2012, all of which are hereby incorporated by reference in theirentirety for all purposes as if fully set forth herein.

TECHNICAL FIELD

The present invention relates to a method and apparatus for coding amultiview video signal.

BACKGROUND ART

Compression refers to a signal processing technique for transmittingdigital information through a communication line or storing the digitalinformation in a form suitable for a storage medium. Compression targetsinclude audio, video and text information. Particularly, a technique ofcompressing images is called video compression. Multiview video hascharacteristics of spatial redundancy, temporal redundancy andinter-view redundancy.

DISCLOSURE Technical Problem

An object of the present invention is to improve video signal codingefficiency.

Technical Solution

The present invention acquires motion information generated bypredictively coding a picture of a reference view and acquires motioninformation on part of blocks of a picture of a non-reference view fromamong motion information generated by predictively coding the picture ofthe non-reference view.

In addition, the present invention compresses acquired motioninformation using motion vector direction information of thecorresponding picture and stores the compressed motion information.

Advantageous Effects

The present invention can reduce the size of a storage and the quantityof data by acquiring compressed motion information of a picture of anon-reference view and improve prediction accuracy by acquiring motioninformation of a picture of a reference view, used for motion estimationof the picture of the non-reference view, without compressing the motioninformation of the picture of the reference view.

In addition, the present invention can reduce the size of the storage byvariably compressing acquired motion information according to motionvector direction information of the corresponding picture and storingthe compressed motion information.

DESCRIPTION OF DRAWINGS

FIG. 1 is a block diagram of a video encoder according to an embodimentof the present invention.

FIG. 2 illustrates a configuration of an inter-prediction unit accordingto an embodiment of the present invention.

FIGS. 3 to 8 illustrate methods for acquiring, compressing and storingmotion information according to embodiments of the present invention.

FIG. 9 is a flowchart illustrating a method for acquiring and storingmotion information according to an embodiment of the present invention.

FIG. 10 is a flowchart illustrating a method for compressing and storingacquired motion information according to an embodiment of the presentinvention.

Best Mode

According to an embodiment of the present invention, a method forprocessing a multiview video signal includes: acquiring motioninformation generated by predictively coding a picture of a referenceview; acquires motion information on part of blocks of a picture of anon-reference view, from among motion information generated bypredictively coding the picture of the non-reference view; andcompressing the motion information acquired for the picture of thereference view and the motion information acquired for the picture ofthe non-reference view and storing the compressed motion information.

According to an embodiment of the present invention, an apparatus forprocessing a multiview video signal includes: a motion informationacquisition unit for acquiring motion information generated bypredictively coding a picture of a reference view and acquiring motioninformation on part of blocks of a picture of a non-reference view, fromamong motion information generated by predictively coding the picture ofthe non-reference view; and a motion information storage unit forcompressing the motion information acquired for the picture of thereference view and the motion information acquired for the picture ofthe non-reference view and storing the compressed motion information.

Modes for Invention

Techniques for compressing or decoding multiview video signal dataconsider spatial redundancy, temporal redundancy and inter-viewredundancy. In the case of a multiview image, multiview texture imagescaptured at two or more views can be coded in order to generate athree-dimensional image. Furthermore, depth data corresponding to themultiview texture images may be coded as necessary. The depth data canbe compressed in consideration of spatial redundancy, temporalredundancy or inter-view redundancy. Depth data is information on thedistance between a camera and a corresponding pixel. The depth data canbe flexibly interpreted as depth related information such as depthinformation, a depth image, a depth picture, a depth sequence and adepth bitstream in the specification. In addition, coding can includeboth the concepts of encoding and decoding in the specification and canbe flexibly interpreted within the technical spirit and scope of thepresent invention.

A texture block of a neighboring view can be specified using aninter-view displacement vector. Here, the inter-view displacement vectormay be derived using an inter-view displacement vector of a neighboringblock of a current view texture block and using a depth value of thecurrent view texture block.

FIG. 1 is a block diagram of a video encoder according to an embodimentof the present invention.

Referring to FIG. 1, the video encoder may include a transformunit/quantization unit 110, an inverse quantization unit/inversetransform unit 120, a filtering unit 130, an intra prediction unit 140,an inter-prediction unit 150, a decoded picture buffer unit 160, and anentropy coding unit 170.

In the transform unit/quantization unit 110, a transform unit transformstexture data with respect to an input video signal to acquire atransform coefficient. Discrete cosine transform (DCT), wavelettransform or the like may be used as a transform method. A quantizationunit quantizes the transform coefficient output from the transform unit.

The inverse quantization unit/inverse transform unit 120 applies aquantization parameter to the quantized transform coefficient to acquirea transform coefficient and inversely transforms the transformcoefficient to decode texture data. Here, the decoded texture data ordepth data may include residual data according to prediction.

The filtering unit 130 performs filtering operation for improvement ofquality of the decoded texture data. Filtered texture pictures may bestored in the decoded picture buffer unit 160 to be output or used asreference pictures.

The intra prediction unit 140 may perform intra prediction using decodedtexture data in a current view texture picture. Here, coding informationused for intra prediction can include an intra prediction mode andpartition information of intra prediction.

The inter-prediction unit 150 may perform motion compensation of acurrent block using reference pictures and motion information stored inthe decoded picture buffer unit 160. In the specification, motioninformation can include a motion vector and reference index informationin a broad sense. In addition, the inter-prediction unit 150 can performtemporal inter-prediction for motion compensation. Temporalinter-prediction may refer to inter-prediction using a referencepicture, which corresponds to the same view as a current texture blockand to a different time from the current texture block, and motioninformation of the current texture block. In the case of a multiviewimage captured using a plurality of cameras, inter-view inter-predictionmay be performed in addition to temporal inter-prediction. Inter-viewinter-prediction may refer to inter-prediction using a referencepicture, which corresponds to a different view from the current textureblock, and motion information of the current texture block.

The inter-prediction unit 150 may include a motion informationacquisition unit and a motion information storage unit to store encodedmotion information. Motion information of each view, stored in themotion information storage unit, can be transmitted to a decoder. Thiswill be described in detail with reference to FIG. 2.

The decoded picture buffer unit 160 stores or opens precoded texturepictures in order to perform inter-view prediction. Here, a frame numberframe_num and a picture order count (POC which indicates picture outputorder) of each picture can be used to store each picture in the decodedpicture buffer unit 160 or to open each picture.

The entropy coding unit 170 generates a video signal bitstream byentropy-coding the quantized transform coefficient, intra codinginformation, inter coding information and reference region informationinput from the inter-prediction unit 150.

A description will be given of compression and storage of motioninformation in multiview video signal processing.

FIG. 2 illustrates a configuration of the inter-prediction unitaccording to an embodiment of the present invention.

The inter-prediction unit 150 may include a processing unit 151, amotion information acquisition unit 152 and a motion information storageunit 153.

The processing unit 151 can generate motion information forinter-prediction. Specifically, the processing unit 151 can receive amultiview video signal and predictively code pictures in an access unit(AU) to generate motion information for inter-prediction. Here, theaccess unit is a multiview video signal coding unit and can includetexture pictures and depth pictures of views at the same time.

The motion information acquisition unit 152 can temporarily acquiremotion information of each view, generated by the processing unit 151,and temporarily store the acquired motion information.

According to an embodiment of the present invention, the motioninformation acquisition unit 152 may acquire motion information on allblocks included in a picture of a reference view, from among motioninformation generated by predictively coding the picture of thereference view. In the case of a non-reference view, however, the motioninformation acquisition unit 152 may acquire only motion information onpart of blocks included in a picture of the non-reference view. Here,the reference view refers to a base view or an independent view (V0)used for inter-view inter-prediction and the non-reference view refersto a view other than the reference view.

A detailed motion information acquisition method will be described withreference to FIG. 4.

The motion information storage unit 153 compresses and stores the motioninformation acquired by the motion information acquisition unit 152.Specifically, the motion information storage unit 153 may compressmotion information acquired for a picture of each view at apredetermined rate and store the motion information.

According to an embodiment of the present invention, the motioninformation storage unit 153 can store motion information on a blockhaving a predetermined size from among motion information acquired fromthe picture of the reference view and the picture of the non-referenceview.

The motion information storage unit 153 can store motion information ona block having a size determined according to motion vector directioninformation of a picture using the motion vector direction information.Here, motion vector direction information refers to the ratio of ahorizontal component of a motion vector to a vertical component thereof.

A detailed description will be given of a method for storing motioninformation with reference to FIGS. 3 to 7.

FIGS. 3 to 7 illustrate methods for acquiring, compressing and storingmotion information according to embodiments of the present invention.

Referring to FIG. 3, the processing unit can predictively code pictures310 included in one access unit of a multiview video signal. Theprocessing unit can predictively code pictures (texture 0, depth 0) of areference view to generate motion information and then predictively codepictures (texture 1, depth 1, texture 2, depth 2) of a non-referenceview to generate motion information.

The motion information acquisition unit can acquire the motioninformation, generated by the processing unit, at full resolution (320).Acquisition of motion information at full resolution means acquisitionof motion information on all blocks in a picture. The motion informationacquisition unit can acquire motion information in predictive codingorder and temporarily store acquired motion information until allpictures of one access unit are predictively coded.

In addition, the motion information storage unit can compress the motioninformation, acquired by the motion information acquisition unit, perpicture and store the compressed motion information (330).

Specifically, the motion information storage unit can store motioninformation on a block having a predetermined size, from among motioninformation acquired from the pictures of the reference view andnon-reference view.

If one picture consists of 16*16 blocks, the motion information storageunit determines 4*4 blocks having representative motion information forevery 16*16 blocks in an embodiment of a 1/16 compression and storagescheme according to the present invention. That is, it is possible tocompress motion information by storing motion information on upper left4*4 blocks, from among 16*16 blocks of one picture, as representativemotion information of the current 16*16 blocks, instead of storingmotion information on all the blocks (16*16 blocks) of one picture.Alternatively, motion information on upper right 4*4 blocks or lowerleft 4*4 blocks may be stored as representative motion information.

In the 1/16 compression and storage scheme according to the embodimentof the present invention, the motion information storage unit can storea 1*1 block as representative motion information for every 4*4 blocksthat divide 16*16 blocks into 16 equal parts. That is, motioninformation of the 1*1 block is determined and stored as representativemotion information for each of 16 4*4 blocks. Accordingly, 16 pieces ofmotion information on a 1*1 block are determined as representativemotion information per picture.

According to the aforementioned method, the size of the motioninformation storage unit can be reduced by 1/16 and the decoder can usemotion information stored as representative motion information on 16*16blocks of one picture to perform inter-prediction.

The method of compressing and storing motion information by the motioninformation storage unit has been described with reference to FIG. 3. Adescription will be give of a method of acquiring motion information bythe motion information acquisition unit with reference to FIG. 4.

Referring to FIG. 4, the processing unit can sequentially predictivelycode pictures 410 and 415 included in one access unit of a multiviewvideo signal.

The motion information acquisition unit can acquire motion informationgenerated in the processing unit. The motion information acquisitionunit in FIG. 4 can respectively acquire motion information for thereference view picture 410 and the non-reference view picture 415,distinguished from the method shown in FIG. 3. Specifically, for thereference view picture 410, the motion information acquisition unit canacquire motion information on all blocks included in the reference viewpicture 410 (420) (full resolution). For the non-reference view picture410, however, the motion information acquisition unit can acquire onlymotion information on part of blocks included in the non-reference viewpicture 410. That is, motion information on the reference view isacquired in full resolution (420) and motion information on thenon-reference view is acquired in low resolution (425).

For example, when each of the pictures consists of 8M*8M blocks (M beinga natural number), the motion information acquisition unit can determine2M*2M blocks for every 4M*4M blocks in the non-reference view pictureand acquire motion information of the determined 2M*2M blocks asrepresentative motion information of the 4M*4M blocks.

When M=2, the motion information acquisition unit can acquire motioninformation on 4*4 blocks as representative motion information for every8*8 blocks that divide 16*16 blocks into four equal parts. That is, themotion information acquisition unit determines motion information on 4*4blocks as representative motion information for every 8*8 blocks.Accordingly, 4 pieces of motion information on 4*4 blocks are determinedand acquired as representative motion information per picture. In thiscase, motion information can be acquired in ¼ resolution.

When motion information is acquired through the aforementioned method,it is possible to reduce the size of a storage and the quantity of datacompared to the method of acquiring full-resolution motion informationfor all pictures of an access unit. Furthermore, since motioninformation of a reference view can be used for predictive coding of anon-reference view, predictive coding accuracy can be improved byacquiring full resolution motion information.

The motion information storage unit can compress and store the motioninformation, acquired by the motion information acquisition unit, perpicture.

Specifically, the motion information storage unit can determine blockshaving predetermined sizes for a reference view picture and anon-reference view picture and store motion information on thedetermined blocks having the predetermined sizes, from among motioninformation acquired by the motion information acquisition unit.

For example, when the reference view picture and non-reference viewpicture are composed of 8M*8M blocks (M being a natural number), themotion information storage unit can determine 2M*2M blocks for each ofthe reference view picture and the non-reference view picture and storemotion information on the determined 2M*2M blocks, from among motioninformation acquired per picture by the motion information acquisitionunit.

If M=2, the motion information storage unit can select 4*4 blocks fromthe motion information acquired per picture by the motion informationacquisition unit and store the selected 4*4 blocks. That is, the motioninformation storage unit stores motion information of 4*4 blocks perpicture consisting of 16*16 blocks. In this case, motion information canbe compressed and stored in 1/16 resolution.

Even in the method of FIG. 4, motion information can be compressed andstored as in the method described with respect to the motion informationstorage unit of FIG. 3.

FIGS. 5, 6 and 7 illustrate a method for compressing and storing motioninformation using motion vector direction information according to anembodiment of the present invention.

The motion vector direction information refers to the ratio of ahorizontal component of a motion vector to a vertical component thereof.Motion vector direction information on a non-reference view picture ofan access unit (AU) can inherit motion vector direction information on areference view picture.

Specifically, when a picture has a horizontal motion, motion vectordirection information with respect to the picture can indicate that thehorizontal component of a motion vector with respect to the picture islarger than the vertical component thereof. When the horizontalcomponent of the motion vector is larger than the vertical componentthereof, motion information can be stored in higher horizontalresolution and lower vertical resolution.

That is, P*Q blocks (P and Q being natural numbers) can be determinedusing motion vector direction information of a picture and motioninformation on P*Q blocks from among motion information acquired frompictures of a reference view and a non-reference view can be stored.

When the corresponding motion vector direction information indicatesthat the horizontal component of the corresponding motion vector of thepicture is larger than the vertical component thereof, P>Q can bedetermined. This will be described in detail with reference to FIG. 5.

Conversely, when the motion vector direction information indicates thatthe vertical component of the motion vector of the picture is largerthan the horizontal component thereof, P<Q can be determined. This willbe described in detail with reference to FIG. 6.

FIG. 5 illustrates a method for compressing and storing motioninformation when motion vector direction information indicates that ahorizontal component of a motion vector is larger than a verticalcomponent thereof.

Referring to FIG. 5, when the motion vector direction informationindicates that the horizontal component of the motion vector is largerthan the vertical component thereof, motion information can be stored inhigher horizontal resolution and lower vertical resolution in the motioninformation storage unit.

For example, the motion information storage unit can determine 8*2blocks from among motion information acquired per picture and storemotion information 530 on the determined 8*2 blocks from among motioninformation 520 acquired per picture by the motion informationacquisition unit.

That is, the motion information storage unit stores motion informationon 8*2 blocks per picture consisting of 16*16 blocks. In this case, themotion information can be compressed and stored in 1/16 resolution.

FIG. 6 illustrates a method for compressing and storing motioninformation when motion vector direction information indicates that avertical component of a motion vector is larger than a horizontalcomponent thereof.

Referring to FIG. 6, when the motion vector direction informationindicates that the vertical component of the motion vector is largerthan the horizontal component thereof, motion information can be storedin higher vertical resolution and lower horizontal resolution.

For example, the motion information storage unit can determine 2*8blocks from among motion information acquired per picture and storemotion information 630 on the determined 2*8 blocks from among motioninformation 620 acquired per picture by the motion informationacquisition unit.

That is, the motion information storage unit stores information on 2*8blocks per picture consisting of 16*16 blocks. In this case, the motioninformation can be compressed and stored in 1/16 resolution.

In FIGS. 5 and 6, motion vector direction information aboutnon-reference view pictures of the access units succeed to motion vectordirection information about reference view pictures, and the motionvector direction information about the access unit of FIG. 5 is the sameas the motion vector direction information about the access unit of FIG.6.

FIG. 7 illustrates a method for compressing and storing motioninformation when pictures of views, included in an access unit, havedifferent motion vector direction information.

Referring to FIG. 7, the motion information storage unit can setresolution of motion information, stored therein, per picture usingmotion vector direction information of each picture.

When motion vector direction information of a picture (texture 0) of thereference view indicates that the vertical component of a motion vectorwith respect to the picture is larger than the horizontal componentthereof, the motion information storage unit can store motioninformation about the reference view picture in higher horizontalresolution.

When motion vector direction information of a picture (texture 1) of thenon-reference view indicates that the horizontal component of a motionvector with respect to the picture is larger than the vertical componentthereof, the motion information storage unit can store motioninformation about the non-reference view picture in higher verticalresolution.

For example, 8*2 blocks, from among motion information acquired from thereference view picture (texture 0), can be determined and motioninformation 730 on the determined 8*2 blocks, from among motioninformation 720 acquired from the reference view picture by the motioninformation acquisition unit, can be stored.

In addition, 2*8 blocks from among motion information acquired from thenon-reference view picture (texture 1) can be determined and motioninformation 735 on the determined 2*8 blocks, from among motioninformation 725 acquired from the non-reference view picture by themotion information acquisition unit, can be stored.

FIG. 8 illustrates an embodiment to which the method for acquiringmotion information, described with respect to FIG. 4, and the method forcompressing and storing motion information using motion vector directioninformation per picture, described with respect to FIG. 7, aresimultaneously applied.

Referring to FIG. 8, the processing unit can sequentially predictivelycode pictures 810 and 815 included in one access unit of a multiviewvideo signal.

The motion information acquisition unit can acquire motion informationgenerated in the processing unit. The motion information acquisitionunit can respectively acquire motion information for the picture 810 ofa reference view and the picture 815 of a non-reference view. The methodfor acquiring the motion information has been described with referenceto FIG. 4 and thus detailed description thereof is omitted.

The motion information storage unit can compress the motion information,acquired by the motion information acquisition unit, per picture andstore the motion information. Particularly, the motion informationstorage unit of FIG. 8 can determine motion vector direction informationper picture and allocate resolution of motion information, which will bestored by the motion information storage unit, per picture.

The method for compressing and storing motion information has beendescribed with reference to FIG. 7 and thus detailed description thereofis omitted.

FIG. 9 is a flowchart illustrating a method for acquiring and storingmotion information according to an embodiment of the present invention.

Referring to FIG. 9, an encoder according to an embodiment of thepresent invention may acquire motion information generated bypredictively encoding a picture of a reference view (S910). In addition,the encoder may acquire motion information regarding part of blocks of apicture of a non-reference view, from among motion information generatedby predictively encoding the picture of the non-reference view (S920).

Here, if each picture is composed of 8M*8M blocks (M being a naturalnumber), 2M*2M blocks can be determined for every 4M*4M blocks in thepicture of the non-reference view and motion information on thedetermined 2M*2M blocks can be acquired as representative motioninformation on the 4M*4M blocks, thereby acquiring the motioninformation with respect to part of the blocks of the picture of thenon-reference view.

In one embodiment, the 2M*2M blocks can be determined by selecting upperleft 2M*2M blocks in the 4M*4M blocks.

A decoder can compress the motion information acquired for each pictureof the reference view and each picture of the non-reference view andstore the motion information (S930). Here, the motion information can becompressed and stored through the aforementioned method of determining2M*2M blocks for each of pictures of the reference view andnon-reference view and storing motion information on the determined2M*2M blocks from among the acquired motion information.

FIG. 10 is a flowchart illustrating a method for compressing and storingacquired motion information according to an embodiment of the presentinvention.

Referring to FIG. 10, the decoder can determine P*Q using motion vectordirection information of a picture (S1010) (P and Q being naturalnumbers). A method for determining P*Q has been described with referenceto FIGS. 5, 6 and 7 and thus detailed description thereof is omitted.

Motion information on P*Q blocks, from among motion information acquiredfrom a picture of a reference view, can be stored (1020), and motioninformation on the P*Q blocks, from among motion information acquiredfrom a picture of a non-reference view, can be stored (1030).

The methods for processing multiview video signals of the presentinvention, as illustrated in FIGS. 9 and 10, can reduce the size of astorage and the quantity of data information by compressing motioninformation of non-reference view pictures and improve predictionaccuracy by acquiring motion information of the reference view pictures,used for motion estimation of the non-reference view pictures, withoutcompressing the motion information of the reference view pictures.

Furthermore, acquired motion information can be variably compressed andstored according to motion vector direction information of pictures soas to reduce the size of the storage.

As described above, the decoding/encoding apparatus to which the presentinvention is applied may be included in a multimedia broadcasttransmission/reception apparatus such as a DMB (digital multimediabroadcast) system to be used to decode video signals, data signals andthe like. In addition, the multimedia broadcast transmission/receptionapparatus may include a mobile communication terminal.

The decoding/encoding method to which the present invention is appliedmay be implemented as a computer-executable program and stored in acomputer-readable recording medium and multimedia data having a datastructure according to the present invention may also be stored in acomputer-readable recording medium. The computer-readable recordingmedium includes all kinds of storage devices storing data readable by acomputer system. Examples of the computer-readable recording mediuminclude a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, anoptical data storage device, and a medium using a carrier wave (e.g.transmission through the Internet). In addition, a bitstream generatedaccording to the encoding method may be stored in a computer-readablerecording medium or transmitted using a wired/wireless communicationnetwork.

INDUSTRIAL APPLICABILITY

The present invention can be used to code a video signal.

The invention claimed is:
 1. A method for processing a multiview videosignal, comprising: acquiring reference view motion information of allblocks included in a reference view picture, wherein the reference viewpicture is included in a reference view; acquiring non-reference viewmotion information on part of blocks included in a non-reference viewpicture, wherein the non-reference view picture is included in anon-reference view and the non-reference view picture is coded using theinformation of reference view; and compressing the reference view motioninformation and the non-reference view motion information bypredetermined resolution; and storing the compressed reference viewmotion information and the compressed non-reference view motioninformation in a decoded picture buffer unit, wherein a number of theall blocks from which the reference view motion information is acquiredis larger than a number of the part of blocks from which thenon-reference view motion information is acquired, wherein each of thereference view picture and the non-reference picture is composed of8M*8M blocks (M being a natural number), wherein the number of thereference view motion information is 8M*8M, wherein the acquiring thenon-reference view motion information on part of blocks of thenon-reference view picture comprises: determining 2M*2M blocks for each4M*4M block in the picture of the non-reference view; and acquiring thenon-reference view motion information on the determined 2M*2M blocks asrepresentative motion information of the 4M*4M blocks, wherein thedecoded picture buffer allocates a size of the decoded picture buffer inwhich the compressed reference view motion information is stored to belarger than a size of the decoded picture buffer in which the compressednon-reference view motion information is stored.
 2. The method accordingto claim 1, wherein the determining of the 2M*2M blocks comprisesselecting upper left 2M*2M blocks in the 4M*4M blocks.
 3. The methodaccording to claim 1, wherein the compressing and storing of the motioninformation comprises: determining 2M*2M blocks for each of the pictureof the reference view and the picture of the non-reference view; andstoring motion information on the determined 2M*2M blocks from among theacquired motion information.
 4. The method according to claim 1, whereinthe compressing and storing of the motion information comprises:determining P*Q (P and Q being natural numbers) using motion vectordirection information of the pictures; storing motion information on P*Qblocks from among the motion information acquired from the picture ofthe reference view; and storing motion information on P*Q blocks fromamong the motion information acquired from the picture of thenon-reference view, wherein the motion vector direction information isthe ratio of a horizontal component of a motion vector to a verticalcomponent thereof.
 5. The method according to claim 1, wherein themotion information includes a motion vector and reference indexinformation.
 6. The methods according to claim 1, wherein thepredetermined resolution of the compressed reference view motioninformation is different from the predetermined resolution of thecompressed non-reference view motion information.
 7. An apparatus forprocessing a multiview video signal, comprising: a processor; and amotion information acquisition unit included in an inter prediction unitthat; acquires reference view motion information all blocks included ina reference view picture, wherein the reference view picture is includedin a reference view; and acquires non-reference view motion informationon part of blocks included in a non-reference view picture, wherein thenon-reference view picture is included in a non-reference view and thenon-reference view picture is coded using the information of referenceview; and a motion information storage unit included in the interprediction unit that: compresses the reference view motion informationand the non-reference view motion information; and stores the compressedreference view motion information, wherein the non-reference viewpicture is included in a non-reference view motion information and thecompressed non-reference view motion information in a decoded picturebuffer unit, wherein a number of the all blocks from which the referenceview motion information is acquired is larger than a number of the partof blocks from which the non-reference view motion information isacquired, wherein each of the reference view picture and thenon-reference pictures is composed of 8M*8M blocks (M being a naturalnumber), wherein the number of the reference view motion information is8M*8M, wherein motion information acquisition unit determines 2M*2Mblocks for each 4M*4M block in the non-reference picture and acquiresthe non-reference view motion information on the determined 2M*2M blocksas representative motion information of the 4M*4M blocks, wherein thedecoded picture buffer allocates a size of the decoded picture buffer inwhich the compressed reference view motion information is stored to belarger than a size of the decoded picture buffer in which the compressednon-reference view motion information is stored.
 8. The apparatusaccording to claim 7, wherein the motion information acquisition unitselects upper left 2M*2M blocks in the 4M*4M blocks.
 9. The apparatusaccording to claim 7, wherein the motion information storage unitdetermines 2M*2M blocks for each of the picture of the reference viewand the picture of the non-reference view and stores motion informationon the determined 2M*2M blocks from among the acquired motioninformation.
 10. The apparatus according to claim 7, wherein the motioninformation storage unit determines P*Q (P and Q being natural numbers)using motion vector direction information of the pictures, stores motioninformation on P*Q blocks from among the motion information acquiredfrom the picture of the reference view and stores motion information onP*Q blocks from among the motion information acquired from the pictureof the non-reference view, wherein the motion vector directioninformation is the ratio of a horizontal component of a motion vector toa vertical component thereof.
 11. The apparatus according to claim 7,wherein the motion information includes a motion vector and referenceindex information.
 12. The apparatus according to claim 7, wherein thepredetermined resolution of the compressed reference view motioninformation is different from the predetermined resolution of thecompressed non-reference view motion information.